Travel is a MAJOR issue here.
Sickness is now very, very mobile. This will change the way selection is
carried out.....at least the speed at which it happens will.
A possible solution, is to STRESS that ill people stay home. Don't go
out and spread it by travelling to Europe or even the supermarket.
Schools could also require that ill students stay home and have their
assignments phoned into them...... There may come a day, when a law
arises that makes sick people stay home. This may feel like a violation
of rights, but so is a killer disease! Besides, many sick people need
the rest!